bisecting fixing commit since e3a56aaade89bc89f33baec11b12538fc22536e2 building syzkaller on 2df221f6ab480a3f2d315d283f26cfae890da3a1 testing commit e3a56aaade89bc89f33baec11b12538fc22536e2 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 7ac9bc973d20b8c841ea800925713a2341b79cad07736f1913d28971d06636e3 all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD b8f3be299d5176348b15cc59d55b85faa3dece68 testing commit b8f3be299d5176348b15cc59d55b85faa3dece68 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 9b1e24de98b3744d9fc4ee66355621885c9a949f9418a0e7e3e70ca1fde18fb8 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 21m55.836786405s (build: 15m4.293767077s, test: 6m25.690751642s) the crash still happens on HEAD commit msg: Linux 4.14.282 crash: unregister_netdevice: waiting for DEV to become free IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout